by THEYUMMYBOWL
Make the best chicken casserole with creamy cheese sauce, juicy chicken, buttery mushrooms, and a crispy topping—you’ll love it!
Preheat oven to 350°F and grease an 8"x11" dish. Cook pasta in salted water until al dente, rinse, and set aside.
Season chicken with salt and pepper. Melt butter, sear chicken (4 min), then cut into ½-inch cubes. It will finish cooking in the casserole.
Melt butter in the same skillet, sauté mushrooms (4-5 min), then add onion (3-4 min) until golden. Stir in garlic (30 sec), then flour.
Stir in garlic (30 sec), then flour. Reduce heat, gradually add broth, milk, and cream, stirring constantly. Season with salt, pepper, and nutmeg.
Simmer until thickened (3-4 min), then remove from heat and stir in Parmesan. Add pasta, chicken, and peas, mix well, and transfer to the baking dish.
Mix breadcrumbs with melted butter and sprinkle over the casserole. Bake for 25-30 min until golden. Serve warm with green onions.